1// Copyright (C) 2022 The Android Open Source Project 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15import {hsluvToHex} from 'hsluv'; 16 17class HsluvCache { 18 storage = new Map<number, string>(); 19 20 get(hue: number, saturation: number, lightness: number): string { 21 const key = hue * 1e6 + saturation * 1e3 + lightness; 22 const value = this.storage.get(key); 23 24 if (value === undefined) { 25 const computed = hsluvToHex([hue, saturation, lightness]); 26 this.storage.set(key, computed); 27 return computed; 28 } 29 30 return value; 31 } 32} 33 34const cache = new HsluvCache(); 35 36export function cachedHsluvToHex( 37 hue: number, saturation: number, lightness: number): string { 38 return cache.get(hue, saturation, lightness); 39} 40